cr125 race kart

[sebastiaan]

hello,

My name is Sebastiaan and this is my first post on this nice forum
I'm from Belgium (Europe), so sorry if my english is not that good.
I'm 19 years old, I'm doing my second year mechanical engineering at the university and I like everything with an engine especially with a big 2stroke.

A couple of months ago I started a new project; a cr125 cross engine on a delta/mari shifter kart frame.
The frame:

I build an model enginemount out of thin sheet metal. I can use this one to see where everything has to be mounted (supports for the airfilter, exhaust,..). The real motormount will be made out of 4.5mm stainless steel.

The mount:

The upper frame clamps are different, they are allready fineshed:

http://i12.photobucket.com/albums/a204/joris1976/stuen002.jpg

The 4.5 mm steel is laser cut.

Let me know what you think about it!

Sebastiaan

 

[anderkart]

Wow thats a realy nice kart you got there Sebastiaan. Your motor mount drawing looks great, just make sure you double nut or safety wire all your bolts so they dont rattle loose.

If your motor mount doesnt work out, you should be able to buy one that would bolt your engine right up to your frame. You'll find some here: http://sharkshifter.com/zc/index.php?main_page=index&cPath=31&zenid=ad2ab41c03ab281e77249ea304a445a9

ps: your English is very good!

 

[Kaptain Krunch]

That airfilter is cool looking, is that hand made?

 

[Kaptain Krunch]

Nah, Thats your typical shifter cart airbox, I have a Tony Kart one laying around here.

I always thought they would be using UNIs or K&N, guess i havent been paying attention.

 

[anderkart]

Theres probably a standard K&N or a UNI filter inside that housing. Most tracks require 2 stroke karts to run that type of filter housing to be a bit of help silencing engine noise from the intake side.

Some tracks are super strick about how loud your race kart can be, you should check out some of the huge RLV mufflers/silencers required to race on many Canadian sprint/shifter-kart tracks: http://www.out2win.com/catalog/exhaust_ohv.html#WF

 

[anderkart]

Cause sooner or later someone usually moves in right next door to a kart track (way out in the middle of nowhere) ... and then starts issuing noise complaints. That and the kart tracks are probably trying to protect the drivers from any possible hearing damage.

Drag strips don't usually have any noise restrictions but many other forms of racing require mufflers nowadays.

 

[sebastiaan]

yes there is a standard filter in that housing. We have to use this kind of filters otherwise we can't ride on the track. I also need a 'green' silencer -_- Very expensive.. (thanks to the green guys ).
Tonight i can probably pick up the laser cut steel. So i can word on it this weekend!
New pictures will be added soon

 

[sebastiaan]

The steel is cut;



I drilled the holes to mount the engine;



I still have to drill the hole for the engine on the rear.
Normally the other stuff i need will arrive this week.
I think that (if there are not too many problems) i can test ride it in 2 - 3 weeks .

 

[Kenny_McCormic]

Very nice kart, your English beats many Americans.

 

[crazycart]

Looks good...the engraving on the cyl....TR? Trinity Racing? Ported?

 

[sebastiaan]

Thanks, I don't know where TR stands for. The engine is not ported.
I can work on it again in the weekend (in the week I study in another city where I live alone..). I really hope that I can testdrive it soon
It's gonna be a beast! (I hope..)

 

[sebastiaan]

Hello,

I worked again in the weekend. The engine mount is finished;









I made brackets for the airfilter and exhaust, installed the radiatortubes,... I only need a Y pipe for the fuel line and then I should have everything.
I think I can testride it next weekend.

 

[anderkart]

Looking good man

 

[SpyGuy]

. o O (This guy's English is better than half of the people who post on this forum ....)

Looking good on the build so far, sebastian. Please keep up the good work, and keep updating this thread.

 

[sebastiaan]

Thanks! I'm really looking forward to ride this thing. Does anyone has an idee how fast it will go from 0 to 60 mph? I'm thinking it will do it in about 4 - 4.5 seconds? The engine has 38 hp.

 

[robin]

38 at the crank provideing youy can put it down

 

[Kenny_McCormic]

Getting anywhere near 38 on the ground will be an issue, you are going to need some real good tires on the back to hook up with that much.

 

[sebastiaan]

Yes I know that's gonna be an issue. I have Mojo D2 slicks on the back, these tires are like medium soft.

 

[anderkart]

Hey I looked up those Mojo D2 slicks, they look pretty cool man. Their gripping ability will totally depend on how old yours are. With use and as they age, they get harder and harder loosing their ability to grip. Many serious Shifter racers around here end up having to buy a brand new set of tires for every day of racing to remain competitive.

 

[dcook3333]

That's unbelievable. Way to go!